Cricket Series Formats: Bilateral, Triangular, and Multilateral Tournaments Explained
How cricket series are structured — bilateral series between two nations, triangular series with three teams, ICC events with multiple rounds, and the scheduling logic that determines when teams play.
International cricket is organised into series and tournaments with different structural formats. Bilateral series — between two nations — are the standard format for Tests, ODIs, and T20Is. Triangular and multi-team series were common in the 1980s-2000s but have been largely replaced by ICC events. ICC tournaments (World Cups, Champions Trophies, World Test Championship) use group stages followed by knockout rounds. Understanding these formats explains how the international cricket calendar is structured and why certain matches matter more than others.
Bilateral Series: The Standard International Format
A bilateral series consists of a fixed number of matches between two nations, with points or wins determining the series winner. Test series are typically 2-5 Tests; ODI series are 3-5 matches; T20I series are 2-5 matches. Series are played alternately at home and away on a schedule set by the ICC's Future Tours Programme (FTP), which allocates hosting rights years in advance. Series are played for named trophies (the Ashes, Border-Gavaskar Trophy, Wisden Trophy) in bilateral competition between historic rivals.
World Test Championship: Adding Meaning to Bilateral Series
The ICC introduced the World Test Championship (WTC) in 2019 specifically to add significance to bilateral Test series — every bilateral Test series now feeds into the WTC standings, with points allocated for series wins and individual Test wins. The top two teams on the WTC standings after a two-year cycle meet in a final at a neutral venue to determine the World Test Championship title. New Zealand won the inaugural final (2021) against India at Southampton; Australia won the second final (2023) against India at The Oval. The WTC has made every Test in every series count toward a cumulative championship, addressing the historic criticism that too many Tests were played as 'dead rubbers' with no consequence.
Frequently asked questions
Has the World Test Championship succeeded in making every Test match feel meaningful, and what would need to change for it to be the most important event in Test cricket?
The World Test Championship has partially succeeded in its stated goal of making bilateral Test series feel meaningful, but the format has limitations that prevent it from fully displacing the Ashes or other traditional bilateral rivalries as the most significant Test cricket. Successes: the WTC has created genuine stakes for series that previously seemed 'less important' — a series between two mid-table WTC teams that would have been relatively low-profile now has WTC points implications. The final itself — played at Lord's or The Oval, with significant broadcast interest — has been a successful event. Australia's 2023 WTC final win gave them a clear claim to being the best Test team in the world at that moment, a claim that bilateral supremacy alone doesn't fully confer. Limitations: the WTC standings are determined by percentage of points won rather than absolute points (to account for different numbers of Tests played by different nations), which is correct mathematically but is harder to follow intuitively. The two-year rolling format means context from two years ago matters equally with last month's result, which creates counter-intuitive situations. And the Ashes retains a cultural and commercial significance that the WTC cannot replicate — an Ashes result triggers different reactions than the same result would in a WTC points context. What would make it the premier Test event: more frequent finals (annual?), a broadcast deal that gives the final maximum global visibility, a clear pathway to the final that fans can follow through the cycle, and a final format that ensures both teams are at their best (the current neutral-venue timing sometimes disadvantages subcontinental teams in English conditions). These are achievable improvements; the fundamental concept is sound.